Timely and Reliable Philippine Weather Forecast

Philippine Standard Time

Glossary

There are currently 13 names in this directory
PATH
The direction in which the vortex will probably travel.

PERIHELION
The point in the path of a celestial body (as a planet) that is nearest to the sun.

PILOT BALLOON
A small free balloon that drift off which, as observed from the ground, indicates the movements of the air aloft.

POLAR AIR MASS
A mass of very cold, very dry air that forms in polar regions.

POLAR CONTINENTAL AIR MASS
Polar air mass that originates over land or frozen ocean areas in the polar regions. It is characterized by low temperatures, low specific humidity and a high degree of vertical visibility.

POLAR MARITIME AIR MASS
Polar air mass that originally came from the polar regions but has since been modified by reason of its passage over a relatively warm ocean surface. It is characterized by moderately low surface temperatures, moderately high surface specific humidity, and a considerable degree of vertical instability

PRECIPITATION
Any liquid or solid form of water that falls from the atmosphere and reaches the surface of the Earth.

PRESSURE
An elliptical expression, current in meteorological literature, for atmospheric pressure, or barometric pressure.

PRESSURE GRADIENT FORCE
Force acting on air that causes it to move from areas of higher pressure to areas of lower pressure.

PREVAILIING WINDS
The direction from which the wind blows frequently in any location.

PREVAILING WESTERLIES
The belts of winds lying on the poleward sides of the subtropical high-pressure belts.

PSYCHROMETER
An instrument that measures relative humidity of the air.

PYRHELIOMETER
An instrument that measures solar radiation by its heating effects.


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